Dual citizenship, a method, is used to Sandra a citizen of the United States. Thus, option (a) is correct.
What is citizen?
A person who holds legal nationality and is accorded that nation's rights and protections is referred to as a “citizen.”
Dual citizenship refers to having citizenship in two nations at once, sharing the rights and obligations of each nation's citizens. Based on its unique policies, each nation has its own nationality laws.
As a result, option (b) is correct.
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